Shan Zhang, Bolong Huang, Liguang Wang
Aug 11, 2020
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0
Influential Citations
32
Citations
Journal
ACS applied materials & interfaces
Abstract
Cobalt carbonate hydroxide hydrate (CCHH) is long merely functioned as the precursor to prepare the compound catalyst; however, its intrinsic potential for oxygen evolution reaction (OER) is quite limited due to its poor catalytic activity. Herein, a concept has been proposed to solve this issue by atomically doping of iron into CCHH nanowires that grown on nickel foam (defined as Fe-CCHH/NF) for achieving efficient OER catalysis by in-situ electrochemical transformation. The obtained Fe-CCHH/NF-30 exhibits OER catalytic performance with the overpotential of only 200 mV vs. reversible hydrogen electrode (RHE) at the current density of 10 mA cm-2 and small Tafel slope of 50 mV dec-1 in 1 M KOH. Moreover, it displays stability for over 130 h at large current density of 55 mA cm-2 and no activity decline is observed after 3000 cycle test. The performance of Fe-CCHH/NF-30 renders it one of the most promising OER catalysts. The density functional theory calculation result reveals that the atomically dispersed Fe can greatly enhance the OER activity by lowering the reactive energy barrier.